Mucus filaments are an indicator in routine urinalysis and are secreted by cells. Mucus filaments can be present in normal urine, especially in women’s urine. However, when present in large quantities, it indicates irritation of the urethra or an inflammatory reaction. 1. Mucus filaments are present in the urine in the form of long linear streaks with indistinct edges, pointed and curled ends, varying in size, and common dark and light lines. Mucus filaments can be found in normal urine, especially in women’s urine. However, when a large number of them exist, it indicates that the urethra is irritated or has an inflammatory reaction.2. If there is an elevated mucus filament in routine urine examination, it indicates that there may be an infection in the urinary system, and then it is necessary to combine with other routine urinary examination indexes in a timely manner to determine whether there is an infection in the urinary system. The indicators that can be referred to include red blood cells, white blood cells, nitrite, bacteriophage, etc., and also need to be combined with ultrasound and other test results to comprehensively determine whether the patient’s urinary system is infected. Patients with urinary tract infections should follow the doctor’s instructions for antibacterial and anti-inflammatory treatment, and also need to do more water, more urination, more rest, and actively do a good job of the review work.